update libpng, libz, jpeg building script.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1308 bbd45198-f89e-11dd-88c7-29a3b14d5316

components/external/jpeg/SConscript

@@ -31,7 +31,7 @@ jquant2.c
 jdmerge.c
 jmemnobs.c
 ''')
-CPPPATH = [RTT_ROOT + '/components/rtgui/common/jpeg']
+CPPPATH = [RTT_ROOT + '/components/external/jpeg']
 
 group = DefineGroup('jpeg', src, depend = ['RTGUI_IMAGE_JPEG'], CPPPATH = CPPPATH)
 

components/external/libpng/SConscript

@@ -21,7 +21,7 @@ pngwrite.c
 pngwtran.c
 pngwutil.c
 ''')
-CPPPATH = [RTT_ROOT + '/components/rtgui/common/libpng']
+CPPPATH = [RTT_ROOT + '/components/external/libpng']
 
 group = DefineGroup('libpng', src, depend = ['RTGUI_IMAGE_PNG'], CPPPATH = CPPPATH)
 

components/external/libz/SConscript

@@ -16,7 +16,7 @@ trees.c
 uncompr.c
 zutil.c
 ''')
-CPPPATH = [RTT_ROOT + '/components/rtgui/common/libz']
+CPPPATH = [RTT_ROOT + '/components/external/libz']
 
 group = DefineGroup('libz', src, depend = ['RTGUI_IMAGE_PNG'], CPPPATH = CPPPATH)